... hourKnotsCalmCalm1–23–89–1415–2021–2526–3132–3738–4344–4950–5455–6061–6667–7172–7778–8384–89119–1231–23–78–1213–1718–2223–2728–3233–3738–4243–4748–5253–5758–6263–6768–7273–77 103 107 NL 101 2 101 6 102 0 102 4 101 2x'x 100 8 100 8 100 4 100 0996992988984980976972FIGURE 6.12Surface weather map for 6 A.M. (CST), Tues-day, November 10, 1998. Dark ... pressure. The lows that form over the warm land are thermal lows. On the July map (Fig. 7.16b), warm thermal lows are foundGlobal Winds 183Icelandic lowBermuda high 100 8 100 2 101 4 102 0 102 6 101 4 100 8 100 2996 102 0LLHHHHLH 102 6 102 0 101 4 101 4PacifichighThermal ... the isobars, the greater the pressuregradient. The greater the pressure gradient, the stronger the pressure gradient force (PGF). The stronger the PGF, the greater the wind speed. The red arrows...